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Energy Harvested from Evaporation Could Power Much of U.S., Says Study

September 26, 2017

Energy harvested from evaporation can cut by half the amount of water lost to natural evaporation, researchers say. Water-strapped cities with growing populations and energy needs could benefit most, including greater Phoenix, served by the above reservoir and irrigation system fed by the Colorado River. (Central Arizona Project)

Other Potential Benefits Include Reliability and Water Savings

In the first evaluation of evaporation as a renewable energy source, researchers at Columbia University find that U.S. lakes and reservoirs could generate 325 gigawatts of power, nearly 70 percent of what the United States currently produces.

Though still limited to experiments in the lab, evaporation-harvested power could in principle be made on demand, day or night, overcoming the intermittency problems plaguing solar and wind. The researchers’ calculations are outlined in the Sept. 26 issue of Nature Communications.

“We have the technology to harness energy from wind, water and the sun, but evaporation is just as powerful,” says the study’s senior author Ozgur Sahin, a biophysicist at Columbia. “We can now put a number on its potential.”

Evaporation is nature’s way of cycling water between land and air. Sahin has previously shown how this basic process can be exploited to do work. One machine developed in his lab, the so-called Evaporation Engine, controls humidity with a shutter that opens and closes, prompting bacterial spores to expand and contract. The spores’ contractions are transferred to a generator that makes electricity. The current study was designed to test how much power this process could theoretically produce.

Southern and western U.S. states have the greatest capacity to produce evaporation-generated power from lakes and reservoirs, a new study in Nature Communications finds.

One benefit of evaporation is that it can be generated only when needed. Solar and wind power, by contrast, require batteries to supply power when the sun isn’t shining and wind isn’t blowing. Batteries are expensive and require toxic materials to manufacture.

“Evaporation comes with a natural battery,” said study lead author, Ahmet-Hamdi Cavusoglu, a graduate student at Columbia. “You can make it your main source of power and draw on solar and wind when they’re available.”

Evaporation technology can also save water. In the study, researchers estimate that half of the water naturally lost from lakes and reservoirs through evaporation could be saved during the energy-harvesting process. In their model, that came to 25 trillion gallons a year, or about a fifth of the water Americans consume.

States with growing populations and sunnier weather can best capitalize on evaporation’s capacity to generate power and reduce water waste, in part because evaporation packs more energy in warm and dry conditions, the researchers say. Drought-prone California, Nevada and Arizona could benefit most.

The researchers simplified their model in several ways to test evaporation’s potential. They limited their calculations to the United States, where weather station data is easily accessible, and excluded prime locations such as farmland, rivers, the Great Lakes, and coastlines, to limit errors associated with modeling more complex interactions. They also made the assumption that technology to harvest energy from evaporation efficiently is fully developed.

Klaus Lackner, a physicist at Arizona State University who was not involved in the study, expressed support for the team’s findings. Lackner is developing artificial trees that draw carbon dioxide from the air, in part, by harnessing the power of evaporation.

“Evaporation has the potential to do a lot of work,” he said. “It’s nice to see that drying and wetting cycles can also be used to collect mechanical energy.”

The researchers are working to improve the energy efficiency of their spore-studded materials and hope to eventually test their concept on a lake, reservoir, or even a greenhouse, where the technology could be used to simultaneously make power and save water.

The study is titled, “Potential for natural evaporation as a reliable renewable energy resource.”

The study’s other authors are Pierre Gentine, a hydrologist at Columbia Engineering and Columbia’s Earth Institute; and Xi Chen, a former Columbia postdoctoral researcher now at City College of New York. The work was funded by the U.S. Department of Energy, David and Lucile Packard Foundation, National Science Foundation and Wyss Institute for Biologically Inspired Engineering.

An evaporation harvesting device made of Legos, a spore-coated rubber sheet, a coil and a magnet. The device produces electricity when sheet bends and straightens in response to moisture. Image Credit: Xi Chen/Columbia University

An illustration of part of Professor Ozgur Sahin’s atomic force microscope, which measures mechanical forces at the molecular level. Seen here is the sharp silicon tip of the device, which scans an object’s surface and bends in response to force.